What is the incremental benefit of using a history of sudden loss of taste (ageusia) and/or smell (anosmia) in symptom screening to identify people who may have COVID-19 and need to take appropriate action?

Using a list of COVID-19-related symptoms as a screening tool can be used for those at high risk for COVID-19 (such as travellers passing through air, land and sea borders) and for the entire population (e.g., on entering schools, stores and workplaces). A recent study published in the journal Nature found that loss of smell (anosmia), skipped meals and fatigue are the three best predictors of COVID-19. We identified 17 evidence documents that provide highly relevant evidence to answer the question of what the incremental benefit is of using a history of sudden loss of taste (ageusia) and/or smell (anosmia) in symptom screening to identify people who may have COVID-19 and need to take appropriate action. We also identified experiences related to the question from five of the six countries examined and for all Canadian provinces and territories.